How to remove incomplete elements in a vector? using loops

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Sandie Nhatien Vu 2016-8-6

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https://ww2.mathworks.cn/matlabcentral/answers/298663-how-to-remove-incomplete-elements-in-a-vector-using-loops

编辑： Sandie Nhatien Vu 2016-8-6

采纳的回答： Guillaume

I have an experiment consisting of id numbers (x.y), where x = experiment number and y = part number.

If l have a vector, let's say:

v(id) = [1.3, 2.2, 2.3, 2.1, 1.1]

and want to remove the incomplete ones, namely: in experiment 1 because part 2 is missing

How can l do that and get the output: ans = 2.2, 2.3, 2.1 (it should remain in the same order as the original)

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Walter Roberson 2016-8-6

Why are you not removing the 2.* series as well, since part 42 of that is missing?

Sandie Nhatien Vu 2016-8-6

Because if there is are 3 id-numbers with the same experiment is complete.

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Answer 1

Guillaume 2016-8-6

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https://ww2.mathworks.cn/matlabcentral/answers/298663-how-to-remove-incomplete-elements-in-a-vector-using-loops#answer_230978

在 MATLAB Online 中打开

This should work:

v = [1.3 2.2 2.3 2.1 1.1];
requiredcount = 3;
experiments = floor(v)';
[uexp, ~, idx] = unique(experiments);
expcount = accumarray(idx, 1); 
exptodiscard = uexp(expcount < requiredcount);
v(ismember(experiments, exptodiscard)) = []

Note that this entirely ignore the part number, it just counts the number of times an experiment is found and if it is less than the required count it is discarded. Therefore, it assumes that part numbers within an experiment are unique.